16694781745 has 16 divisors (see below), whose sum is σ = 21319890768. Its totient is φ = 12506368000.

The previous prime is 16694781743. The next prime is 16694781773. The reversal of 16694781745 is 54718749661.

16694781745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 2589181456 + 14105600289 = 50884^2 + 118767^2 .

It is not a de Polignac number, because 16694781745 - 2¹ = 16694781743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16694781745.

It is not an unprimeable number, because it can be changed into a prime (16694781743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481756 + ... + 515245.

It is an arithmetic number, because the mean of its divisors is an integer number (1332493173).

Almost surely, 2^16694781745 is an apocalyptic number.

It is an amenable number.

16694781745 is a deficient number, since it is larger than the sum of its proper divisors (4625109023).

16694781745 is a wasteful number, since it uses less digits than its factorization.

16694781745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997220.

The product of its digits is 10160640, while the sum is 58.

The spelling of 16694781745 in words is "sixteen billion, six hundred ninety-four million, seven hundred eighty-one thousand, seven hundred forty-five".